MIL-HDBK-1001-5 Roofing And Waterproofing S/S By Mil-Std-3007This handbook sets forth guidelines for design of roofing, LAYOUT 1 and waterproofing systems for building construction. It covers design of new low-slope and steep roof systems, reroofing of existing buildings, and waterproofing, and dampproofing systems.

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MIL-HDBK-1001/5A

Table 2

Minimum Slopes for Steep Roofing

MATERIAL        MIN. SLOPE (in./ft. (percent))

NOTES

Flat Shingle Tile (clay or concrete)

One-piece Barrel Tile

(clay or concrete)

5 (42)

4 (33)         Double-layer felt underlayment required 4-in./ft. (33 percent) slope, single layer for slope greater than 4 in./ft. (33 percent)

Two-piece Shingle Tile

(clay)

4 (33)

Interlocking Flat-ribbed

Tile (clay or concrete)

4 (33)

Asphalt Shingles          4 (33)         1 layer, non-perforated saturated felt underlayment for 2-1/2-in./ft. (21 percent) slope may be used if special precautions, described in the NRCA Steep Roofing Manual and ARMA Residential Asphalt Roofing Manual are taken.

Wood Shakes and Shingles  4 (33)

Metal (Corrugated Stl., Alum.)

3 (25)         Refer to SMACNA Manual.

Standing Seam, Metal      1/2 (4)        Requires floating-clip design.

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